CN1914960A - Method and ballast for driving a high-pressure gas discharge lamp - Google Patents
Method and ballast for driving a high-pressure gas discharge lamp Download PDFInfo
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- CN1914960A CN1914960A CN 200580003349 CN200580003349A CN1914960A CN 1914960 A CN1914960 A CN 1914960A CN 200580003349 CN200580003349 CN 200580003349 CN 200580003349 A CN200580003349 A CN 200580003349A CN 1914960 A CN1914960 A CN 1914960A
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Abstract
Method of driving a high-pressure gas discharge lamp during its steady-state operation, wherein a steady-state current signal is sent through the lamp for maintaining a discharge arc in the lamp, comprising the step of comparing the lamp conductivity response to a current step in said current signal with reference parameters; and in response to said comparison at least one of the following steps: stopping the current supply to the lamp, generating a signal indicating the end-of-life status of the lamp, changing the steady-state current through the lamp, changing the steady-state waveform of the current signal through the lamp, and generating a signal indicating the lamp type, wherein said current step is obtained by sending a current pulse which is superimposed on said steady-state current signal through the lamp.
Description
Technical field
The present invention relates to a kind of method that in the steady state operation process of high-voltage gas discharging light, drives this high-voltage gas discharging light, wherein send steady-state current signal by this lamp, to keep the electric arc in the lamp, this method may further comprise the steps: will compare with basic parameter for the modulating voltage response of the current step in the described current signal; In response to described comparison, carry out following at least one step: stop to this lamp power supply, generate the signal of the end-of-life status of this lamp of expression, generate the signal of the type of indication lamp, change steady state current (intensity), and change stable state waveform by the current signal of this lamp by this lamp.
Background technology
During the 17 the international light source science and technology discussion that 27-31 day August nineteen ninety-five holds in the Tokyo, the K.G ü nther of OSRAM limited company has disclosed this method, and has described this method on the 93-100 page or leaf of the discussion collected works that Japanese illuminating engineering institute publishes nineteen ninety-five.Being taught in herein of the document is incorporated herein by reference, and particularly relates to the instruction of correlation between the conductivity of lamp and its luminosity attribute, and relates to the instruction that response signal is handled and analyzed.
In described discussion collected works, proposed by analyzing the conductivity response in the pulse mode operation ballast, perhaps under the situation of metal halide lamp,, survey the radiation properties of this lamp by decay or the rise time that applies the power step to lamp and measure conductivity response.First kind of possibility is restricted to described pulse working mode in it is used, and second kind of possibility influenced the work of this lamp, makes the intensity of this lamp to increase or to reduce.
Summary of the invention
The objective of the invention is to analyze the conductivity response of lamp for the power step according to certain way, make this method can be used for multiple mode of operation, the intensity of this lamp or colour temperature remain unchanged simultaneously, and perhaps selectable its intensity or colour temperature change according to controlled way.
According to the present invention, being added to by transmission obtains described power step by the current impulse on the steady-state current signal of this lamp.
Therefore, described steady-state current signal can have form arbitrarily, for example sinusoidal form or pure DC, perhaps its combination fully.In addition, the duration of superimposed pulse may be shorter than the decay or the rise time (being typically 10 μ s-1.5ms) of the voltage response of current step in the aforementioned known possibility, and except the decay or the rise time of measuring voltage response, the form of all right analyzing responding.
In first preferred embodiment, the duration of described pulse preferably is shorter than duration half period of the AC current component of steady-state current signal.Superimposed pulse also can be a negative pulse, perhaps " (dip) tilts " in the signal.
In second preferred embodiment, for example under the high-frequency work pattern, the duration of described pulse is the multiple of duration in cycle of the AC current component of steady-state current signal, and wherein this pulse is preferably formed by the amplitude of the interim enhancing of the described AC current component of steady-state current signal.
Preferably, the step of comparative voltage response comprises the die-away time of measuring voltage and itself and benchmark compared die-away time, perhaps the shape of analyzing responding signal and itself and fiducial value compared.
In another preferred embodiment, the step that changes the stable state waveform is included in the step of stack circulating power pulse on the described stable state waveform, and to be used for for example changing the colour temperature of this lamp, described stable state waveform for example is square wave or sine wave.In this manner waveform is become more complicated circulation form, its colour temperature for this lamp is influential, and too much influence needn't be arranged the intensity of this lamp.
The invention still further relates to the ballast that is used to drive high-voltage gas discharging light, it comprises: supply unit is used to send the steady-state current signal by this lamp, to keep the electric arc in this lamp; The response comparison means is used for the modulating voltage response for the current step of described current signal is compared with basic parameter; And responding device, be used in response to described comparison, stop to this lamp power supply, generate the signal of the end-of-life status of this lamp of expression, generate the signal of this lamp type of expression, change steady state current by this lamp, and/or change is by the stable state waveform of the current signal of this lamp, wherein said ballast also comprises pulser, is used to send the current impulse that is added to by on the described steady-state current signal of this lamp, to obtain described current step.Be used for realizing that the device of aforementioned preferred method embodiment can be independently or be included in described ballast in combination.
Description of drawings
Only by way of example, embodiment of the invention will be described with reference to drawings now, in the accompanying drawings:
Fig. 1 has represented the configuration of ballast and lamp;
Fig. 2 has represented the example of the stable state square waveform that uses in the method according to the invention, cycle pulse, composite signal and dynamic electric voltage response thereof;
The curve representation of Fig. 3 with the various white HPS lamp example in different life-spans with different-colour value of its dynamic electric voltage response attenuation time (tau) and modulating voltage (Vla) expression.
Embodiment
With reference to Fig. 1, electric ballast 10 links to each other with high-voltage gas discharging light 11, and this lamp comprises electric arc tube 12, and this electric arc tube has the electrode 13,14 that is sealed in the relative two ends of this pipe.First electrode 13 links to each other with an end of ballast 10, and another electrode 14 links to each other with the other end of ballast 10.
Especially, the problem of white HPS lamp is, the sodium loss of amalgam filler (amalgam fill) in the electric arc tube that causes owing to the corrosion in its life-span or diffusion, and this has caused the colour temperature of this lamp lower.White HPS lamp needs the Electronic Control of a definite form, remains in the acceptable limited field with the color with this lamp.The control algolithm of using in the actual conditions is based on whether have correlation between the colour temperature of this lamp and modulating voltage.This correlation has directly been determined the fact of spectral distribution and electrical characteristics based on Na and Hg vapour pressure.Yet this only just sets up under the situation that has definite relation between these vapour pressures, and this is only applicable to the fixing situation of amalgam composition.For example aging along with lamp, under the situation of the variation that has caused the amalgam composition by corrosion or the diffusion of Na, this correlation lost efficacy.When even the Na vapour pressure in this lamp is high, also can fully suppress the influence of Na corrosion process, to obtain enough lamp life-spans.Yet,, finally be bound to reach the Na loss and become constantly significant along with wearing out of lamp.Consequently the known color control method based on stable state electric light Characteristics Detection must lose efficacy.For outmoded lamp (its Na loss serious), compare with lamp and to observe declining to a great extent of colour temperature, thereby cause the unacceptable faint yellow outward appearance of this lamp with identical modulating voltage.An object of the present invention is to detect the decline of colour temperature, so that when colour temperature is lower than acceptable limited field, determine the end-of-life of this lamp 11, and need not optical gauge, for example photodiode.
Therefore, according to Fig. 2, in upward short (1.4ms is wide) current power pulse (G2) of stack of stable state low frequency (90Hz) square wave current signal (G1) of the 100W of electric ballast manipulation white HPS lamp, thus generation combined current signal (I lamp).Then, the electronic circuit of this ballast 10 detects the dynamic response of modulating voltage (V lamp), and can determine characteristic attenuation or rise time (tau).Generally change in the scope between about 1 μ m and about 1.5 μ m die-away time.
It is evident that according to Fig. 3 in response to the response time of the output pulses that is applied, especially decay or rise time (tau) are for the lamp with sodium loss (have comparatively low colour temperature) and Yan Gengchang.
It is evident that also that according to Fig. 3 the lamp 11 that colour temperature is higher than normal color temperature shows the higher modulating voltage (Vla) relevant with the higher cold-point temperature of this lamp 11, this is that a kind of known effect is (referring to for example European patent application EP-A-2281123).Yet the lamp that colour temperature is lower than average color temperature shows higher modulating voltage (Vla) equally, as shown in Figure 3.Further estimate voltage response, can distinguish two kinds of deviations current impulse.
In this example, the lamp that meets Vla＞105V and tau＜90 μ s can be considered as having too high colour temperature (＞2700K), and the lamp that meets tau＞90 μ s can be considered as having low colour temperature (＜2400K).
Can be in response to described identification turn-off lamp 11.For example in having the high aspect ratio HID blowtorch of sodium cerium filler, can also in response to and influence the colour temperature of this lamp 11 according to determined tau value.This can be by for example adding sufficiently high unidirectional direct-current component to alternating current, and/or realize by the cycle pulse of the enough height and width of stack on electric current.Preferably, this cycle pulse that applies for the colour temperature that changes this lamp is used to trigger aforesaid voltage response simultaneously.
Have been found that, two kinds of methods of adding DC current component and current impulse can influence the colour temperature of various high-voltage gas discharging lights 11, and can utilize the suitable control circuit in the ballast, use this method according to controlled way, yet this is conspicuous to those skilled in the art.
Claims (9)
1. method that in the steady state operation process of high-voltage gas discharging light (11), drives this high-voltage gas discharging light, one of them steady-state current signal (G1) is sent out by this lamp (11), to keep the electric arc in this lamp (11), this method may further comprise the steps: will compare with basic parameter for the modulating voltage response (Vlamp) of the current step in the described current signal; And in response to following at least one step of described comparison: stop to power to this lamp (11), generate the signal of the end-of-life status of this lamp of expression (11), change steady state current by this lamp (11), change stable state waveform by the current signal of this lamp (11), and generate the signal of the type of indication lamp, it is characterized in that being added to by transmission obtains described current step by the current impulse (G2) on the described steady-state current signal (G1) of this lamp (11).
2. method according to claim 1, wherein this steady-state current signal (G1) comprises the alternating current component.
3. method according to claim 2, the duration of wherein said pulse (G2) is shorter than the duration of the half period of the AC current signal of half period of AC current component or steady-state current signal (G1).
4. according to claim 1,2 or 3 described methods, wherein this superimposed pulse (G2) is a negative pulse.
5. method according to claim 2, the duration of wherein said pulse (G2) is the multiple of duration in the AC current component cycle of steady state power signal (G1), and wherein preferably this pulse (G2) comprise the amplitude of interim enhancing of the described AC current component of steady state power signal (G1).
6. according to each described method among the claim 1-4 of front, wherein the step of comparative voltage response (Vlamp) comprises the decay of measuring this voltage or rise time (tau) and with it and benchmark is decayed or the rise time compares.
7. according to each described method among the claim 1-4 of front, wherein the step of comparative voltage response (Vlamp) comprises the analyzing responding signal shape and itself and fiducial value is compared.
8. according to each described method among the claim 1-4 of front, the step that wherein changes stable state waveform (G1) comprises be added to step on the described stable state waveform of circulating current pulse (G2).
9. be used to drive the ballast (10) of high-voltage gas discharging light (11), it comprises: be used for sending the supply unit by the steady-state current signal (G1) of this lamp (11), to keep the electric arc in this lamp (11), be used for the response comparison means that compares for the modulating voltage response (Vlamp) of the current step of described current signal and basic parameter; And responding device, it is used to respond described comparison, stop to power to this lamp (11), generate the signal of the end-of-life status of this lamp of expression (11), generate the signal of the type of indication lamp, change steady state current by this lamp (11), and/or change stable state waveform by the current signal of this lamp (11), it is characterized in that described ballast (10) also comprises and be used for that sending is added to obtains the pulser of described current step by the current impulse (G2) on the described steady-state current signal (G1) of this lamp (11).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP04100287 | 2004-01-28 | ||
| EP04100287.4 | 2004-01-28 | ||
| EP04100641.2 | 2004-02-18 |
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| Publication Number | Publication Date |
|---|---|
| CN1914960A true CN1914960A (en) | 2007-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200580003349 Pending CN1914960A (en) | 2004-01-28 | 2005-01-18 | Method and ballast for driving a high-pressure gas discharge lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102696281A (en) * | 2009-12-30 | 2012-09-26 | 皇家飞利浦电子股份有限公司 | Apparatus for driving a gas discharge lamp |
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2005
- 2005-01-18 CN CN 200580003349 patent/CN1914960A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102696281A (en) * | 2009-12-30 | 2012-09-26 | 皇家飞利浦电子股份有限公司 | Apparatus for driving a gas discharge lamp |
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Open date: 20070214 |